Hybrid Vehicle Clutch Control Feedback Loop
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Solution Overview
Problem
Existing hybrid vehicle clutch engagement control systems fail to effectively manage clutch output speed and torque capacity, leading to unpleasant acceleration changes and clutch degradation due to disregarding clutch output speed and abrupt changes in power source torque characteristics.
Innovation Solution
A clutch engagement control apparatus that calculates target transmission torque capacity considering clutch output speed and employs feedback control to adjust clutch engagement, reducing output speed deviations and varying clutch input speed to maintain stable torque delivery.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Power
If clutch engagement control is achieved by supplying oil pressure to transmit torque capacity, then torque transmission capability is improved, but clutch output speed control is poor leading to unpleasant acceleration changes
Solution Approach 1:
The control system incorporates feedback control by sensing actual clutch input speed and output speed, then adjusting the target clutch transmission torque capacity based on the deviations between actual and target speeds. This closed-loop feedback mechanism enables precise control of clutch output speed while maintaining torque transmission capability.
Solution Approach 2:
The system dynamically adjusts the target clutch transmission torque capacity based on real-time speed deviations and vehicle operating conditions. The control target is not fixed but adapts continuously to maintain optimal clutch output speed control during engagement and operation.
2Device complexity
If clutch engagement control ignores power source torque characteristics, then control simplicity is improved, but clutch degradation occurs due to abrupt torque changes
Solution Approach 1:
The control system performs preliminary action by calculating target clutch input speed and target clutch output speed before adjusting clutch transmission torque capacity. This anticipatory control based on predicted speed targets prevents abrupt torque changes that would otherwise cause clutch degradation.
Solution Approach 2:
The system uses feedback control to continuously monitor actual speeds and adjust torque capacity targets accordingly. This feedback mechanism compensates for power source torque characteristics variations, preventing abrupt changes that lead to clutch wear and degradation.
3Device complexity
If clutch control only considers input speed, then control complexity is reduced, but output speed deviation increases causing unstable acceleration
Solution Approach 1:
The control system implements dual feedback by sensing both clutch input speed and output speed, then using both measurements to determine the target clutch transmission torque capacity. This dual-feedback approach ensures stable output speed control without excessive complexity.
Solution Approach 2:
The system transitions from one-dimensional control (input speed only) to two-dimensional control by incorporating both input speed and output speed as control dimensions. This dimensional expansion enables comprehensive speed control while maintaining manageable system complexity.
Data Source
AI summary
A clutch control apparatus is provided for a hybrid vehicle having at least two different power sources and a clutch disposed between the power sources and the drive wheels arranged to vary a transmission torque capacity. A separate clutch input and output speed sensing device senses the actual clutch input and output speeds respectively. A controller is configured to calculate a target vehicle driving torque according to a driver's operation and the vehicle running condition.